1. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Material Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States